Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
qua ban » cua ban, qua quan
dua ban » dia ban, cua ban, mua ban
van lam » van nam
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky tang ma hoa. hieu van lam ((dua ban) or (qua ban)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky tang ma hoa. hieu van lam ((dua ban) OR (qua ban)) thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky tang ma hoa. hieu van lam ((dua ban) or (qua ban)) thanh tai cua tre*.